Help with slopes

Help with slopes - Man's Hand in Shallow Focus and Grayscale Photography

I am trying to make a large flat platform that slowly drops downhill using half slabs. it is 6 blocks tall and 93 blocks long. How many block do I have to go across before I have to go down 1/2 block? (If you have ever played Pokemon Diamond, Pearl, or Platinum: I am trying to re-create the bike route)

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